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pincushion distortion
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Diagram showing two types of optical distortion: barrel distortion on the left, where grid lines bulge outward, and pincushion distortion on the right, where grid lines curve inward.
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pincushion distortion: Media

optics
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two types of distortion
Two common types of distortion. In barrel distortion (left), magnification decreases...
Encyclopædia Britannica, Inc.